Region Free, so it will work on NTSC 360, etc.
I pretty solid deal right now, though its not selling well so I suspect it will be cheaper sooner rather than later BUT this does come with the preorder DLC (just costumes, one team "ehnacement") that was a Gamestop exclusives here in the states... and according to Insomnaic they have no plans to release it on the marketplace. (and I had no luck finding it here on the forums and the ones on eBay are long gone.)
Edit its a 24 hour deal, they only had 1355 when I first saw it, and they've sold 200 in the first 40 minutes... I would not delay if you want it.